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How many 3-letter sequences can be formed if the second letter must be a vowel (A, E, I, O, or U), and the third letter must be different from the second letter?

 Dec 3, 2021
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26 letters, 5 vowels

5 choices for the second letter, then 25 choices for the 3rd letter, then 26 choices for the first letter.

 

Now what?  

 Dec 3, 2021

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